Sal forest covers 32% ofthe total forest land ofBangladesh. Though there is no record ofsevere infestation
of sal forest by any defoliator insect in Bangladesh. Recently, Altadighi sal forest of Naogaon district is
completely defoliated by an unknown lepidopteran insect affecting the growth ofthe plant seriously. The
insect has been identified as Dendrophleps semihyalina Hampson (Lymantriidae: Lepidoptera). It is a new
record ofsal defoliator in Bangladesh. More than 95% trees were infested by the pest. The peak infestation
period occurred during March and April. Two insecticides namely Malathion 57 EC (malathion) and
Ripcord 10 EC (cypermethrin) were applied on infested trees @2-4 ml/1 and 1-2 ml/1 ofwater respectively
after every seven days for 2 to 3 times. The pest was controlled within two weeks